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Convertible Senior Notes (Tables)
 12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Schedule Of Net Proceeds From Debt Issuance
The total net proceeds from the notes are as follows (in thousands):
 
2025 Notes
 
2023 Notes
Principal amount
$
800,000

 
$
345,000

Less initial purchasers’ discount
(18,998
)
 
(8,625
)
Less other issuance costs
(822
)
 
(757
)
Net proceeds
$
780,180

 
$
335,618
Schedule of Debt
The net carrying amount of the liability component of the notes is as follows (in thousands):
 
December 31, 2019
 
December 31, 2018
 
2025 Notes
 
2023 Notes
 
2023 Notes
Principal amount
$
800,000

 
$
345,000

 
$
345,000

Unamortized debt discount
(184,698
)
 
(42,280
)
 
(54,817
)
Unamortized issuance costs
(12,691
)
 
(5,028
)
 
(6,515
)
Net carrying amount (liability)
$
602,611

 
$
297,692

 
$
283,668

    
The net carrying amount of the equity component of the notes is as follows (in thousands):
 
December 31, 2019
 
December 31, 2018
 
2025 Notes
 
2023 Notes
 
2023 Notes
Debt discount for conversion option
$
212,000

 
$
64,193

 
$
64,193

Issuance costs
(5,253
)
 
(1,749
)
 
(1,749
)
Net carrying amount
$
206,747

 
$
62,444

 
$
62,444
Schedule Of Interest Expense Recognized The following table sets forth the total interest expense recognized related to the notes (in thousands):
 
December 31, 2019
 
December 31, 2018
 
2025 Notes
 
2023 Notes
 
2023 Notes
Contractual interest expense
$
769

 
$
862

 
$
645

Amortization of debt discount
27,302

 
12,536

 
9,377

Amortization of issuance costs
1,876

 
1,488

 
1,117

Total interest expense
$
29,947

 
$
14,886

 
$
11,139